| Summary: | Macadamia (<i>Macadamia integrifolia</i>) is endemic to eastern Australia and produces an edible nut that is widely cultivated in commercial orchards globally. A survey of fungi associated with the grey and green mold symptoms of macadamia flowers found mostly species of <i>Botrytis</i> (Sclerotiniaceae, Leotiomycetes) and <i>Cladosporium</i> (Cladosporiaceae, Dothideomycetes). These isolates included <i>B. cinerea</i>, <i>C. cladosporioides</i>, and unidentified isolates. Amongst the unidentified isolates, one novel species of <i>Botrytis</i> and three novel species of <i>Cladosporium</i> were delimited and characterized by molecular phylogenetic analyses. The new species are <i>Botrytis macadamiae</i>, <i>Cladosporium devikae</i>, <i>C. macadamiae</i>, and <i>C. proteacearum</i>.
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